Operation Manual needed - PLEASE

Question

I came across a radar detector, and i have no knowledge of the specs or operation of the radar detector. I need a manual to understand the set-up and operation, Please Help. The detector does work, but i dont know about the different lights that come on, Its a Whistler 750, radar detector, Serial Number 113165. The S/N is not listed ( its old, probably discontinued. There are 3 Buttons Mute Dark City / plus a on/volume controll. I understand that they operate X Y Z fundamentals ( x-rays ?) Looking forward to ur reply. Thank You Steve Yanowitz Any help would be appreciated. MY e-mail is [e-mail] Cell phone # [phone]. If u call, please leave a voice mail , Im not allowed to have a phone while im working. Have a Good day